High-power turbogenerator with directly cooled stator winding and leads



Dec. 1, 1970 G. GARNITSCHNIG ET AL 3,544,821

. HIGH-POWER TURBOGENERATOR WITH'DIRECTLY COQLED STATQR WINDING 9ASND LEADS Filed Aug 4, 1

United States Patent Oflice PM... piflifil 3 544 821 In the figures, reference number 1 indicates the electrical lead which consists of a hollow conductor that is HIGH-POWER TURBOGENERATOR WITH for instance directly cooled with water and is connected DIRECTLY COOLED STATOR WINDING AND LEADS Giinter Garnitschnig, Birr, Hans Herrmann, Baden, and

to a water-cooled stator winding not shown in the drawmg, whilst 2 is the bushing terminal for the lead. The

Hans Wilchli, Nussbaumen, Switzerland, assignors to flexible connection between lead land terminal bushing Akfi u haft Brown Boveri & Cie d 2 is achieved by means of a plurality of electrically cons i l d, a j i p t k company ductive spirally shaped pipes 3 which are connected in Filed Aug. 4, 1969, Ser. No. 847,035 parallel. These pipes are connected on the one hand to a Claims priority, application Switzerland, Aug. 15, 1968, 10 common header 4 in communication with the lead 1 and 12,299/63 on the other hand to a common header 5 connected to the U 8 Cl 310 54 H021 9/19 3 Claims ter-minal bushing 2, whereby these headers are so constructed that they also serve as distribution chambers for the cooling water. The flexible pipes 3 are connected and r arranged in such a manner that the flow of the cooling ABSTRACT OF THE DISCLOSURE 10 Water is oppositely directed in adjacent pipes as indicated A flexible electrical and hydraulic connection between by the arrows in FIG. 1, so that no resultant magnetic the hollow leads of a hollow stator winding of a highfield is induced which could produce leakage fluxes in power turbogenerator and corresponding terminal bushthe region of the terminal box. ings in the stator casing through which a fluid coolant is Although in the constructional example described, direct passed comprises a plurality of spirally-shaped electrically cooling with water is provided, it is also possible to use a conductive pipes arranged electrically and hydraulically different cooling medium. in parallel. Distribution headers are located at the lead We claim: and bushing ends of the pipes and the coolant passes 1. In a high-power generator including a hollow stator through adjacent pipes in opposite directions so as to winding and hollow leads thereto through which a fluid avoid creation of a magnetic field that could produce coolant is circulated, the improvement which resides in leakage fluxes in the region of the terminal box. a flexible electrical connection provided between said hollow leads and the corresponding terminal bushings in the stator casing, said flexible connection comprising a With turbogenerators for high power it is known that plurality of spirally shaped electrically conductive pipes the terminal bushings of the machine should not be arranged electrically and hydraulically in parallel and mechanically stressed due to movements of the ingoing through which the fluid coolant and current passes.

or outgoing leads within the machine which are caused 2. The invention as defined in claim 1 wherein said flexiby thermal effects. In machines provided with hydrogen ble pipe connection includes a common header arranged gas cooling it is usual to connect the outgoing leads to the at the opposite ends of said pipes, one said header being terminals by means of flexible stranded conductors, wherejoined to said lead and the other header to said terminal by the use of such flexible connections is only possible up bushing, said headers being structured to serve as distributo a certain value of the terminal current. For machines tion chambers for the fluid coolant flowing through said with a high current or for turbogenerators having a liquidpipes.

cooled stator and rotor winding, a form of cooling that 3. The invention as defined in claim 2 wherein said is required to an increasing extent in order to increase pipes are so arranged and connected that the flow of the the output of the machine, it is impossible to use a flexible fluid coolant is oppositely directed in adjacent pipes.

connection of the aforementioned 'kind.

The object of the invention is to provide for a high- References Cited power turbogenerator with directly cooled stator winding UNITED STATES PATENTS and leads, a suitable flexible connection between the leads and the terminal bushings which keeps the temperature-dependent movements of the leads away from the 3322985 5/1967 A b ""1 bushings. In accordance with the invention this is achieved Z u m et a 1 3 353040 11/1967 Abbott 31027 by providing a flexible connectlon, consistmg of a plurality of spiral parallel-connected electrically conductive pipe FOREIGN PATENTS sectlons, between the hollow leads of the stator wmdmg and the corresponding terminal bushings on the stator 1,071,217 12/1959 Germany 310-64 casing 1,140,'639 12/1962 Germany 3lO 64 A constructional example of the invention is now exr' plained by means of the accompanying drawing where 50 DONOVAN DUGGAN Pnmary Exammer FIGS. 1 and 2 show a flexible connection for a lead of the U S 01 X R stator winding of a turbogenerator in front view (partly in section) and lateral view respectively. 31064 

